地质学报（英文版）2002，Vol.76Issue(4)：393-407,15.
Researches on Plants from the Lower Devonian Xujiachong Formation in the Qujing District, Eastern Yunnan
Researches on Plants from the Lower Devonian Xujiachong Formation in the Qujing District, Eastern Yunnan
摘要
Abstract
Fossil plants Hedeia sinica Hao et Gensel 1998, Huia gracilis Wang et Hao 2001 andGuangnania cuneata Wang et Hao are described from the Lower Devonian Xujiachong Formation, the Qujingdistrict, eastern Yunnan, China. They contribute to our knowledge of the flora in this district. Based on theoccurrence of common plants (Hedeia, Huia, Guangnania and Zosterophyllum australianum) and their horizons,it is proved for the first time that the mid-lower assemblage of the Xujiachong flora is comparable with theEarly Devonian ((late) Pragian) Posongchong flora of southeastern Yunnan and the upper Baragwanathia floraof Australia. In view of this fact and the stratigraphic sequence, the mid-lower part of the Xujiachong Formationis considered to be of (late) Pragian age. Through comprehensive analyses of plant, bivalve and fishassemblages and the lithology, the upper part of the Xujiachong Formation is dated to be of early Emsian age.The Xujiachong flora belonged to the northeastern Gondwana palaeophytogeographic unit during the EarlyDevonian. The early Emsian assemblage of this flora inherited the characters of the Posongchong flora and alsoexhibited the endemic elements. Belonging to different phytogeographic units, the Xujiachong and Posongchongfloras differ from the coeval flora of the Laurussian palaeocontinent. The Xujiachong flora is comparativelysimple in composition, while the Posongchong flora has abundant and highly diversified endemics. Thedisparity between them has resulted from the different environments.关键词
Fossil plants/Xujiachong Formation/eastern Yunnan/(late) Pragian-early Emsian/similarity between floras/phytogeography and environmentKey words
Fossil plants/Xujiachong Formation/eastern Yunnan/(late) Pragian-early Emsian/similarity between floras/phytogeography and environment分类
天文与地球科学引用本文复制引用
王德明,郝守刚,刘振锋..Researches on Plants from the Lower Devonian Xujiachong Formation in the Qujing District, Eastern Yunnan[J].地质学报（英文版）,2002,76(4):393-407,15.基金项目
This research was supported by the Chinese Stratigraphy Project of the Ministry of Science and Technology, China (2001DEA20020-5) and the National Natural Science Foundation of China(Grant 49972009). （2001DEA20020-5）
